GLS - 18/5/2006 4:45 AMA couple of interesting questions....When you have a SSME lockup (hydraulic or electrical) at, let's say 82% like STS-3 had, is MECO commanded at the same time for all engines, or you shutdown the locked up SSME just, just before the others, to account for it's higher throttle level??Also, if the 3 engines locked up, would they still go uphill and exceed the 3Gs, or would they shutdown at 3Gs and go ECAL or TAL or whatever?
mkirk - 13/5/2006 6:33 PMI finally downloaded and listened to the audio…I have never bothered to listen to it before. When I get I chance I will have to get a copy of the whole flight loop and booster loops.
zerm - 19/5/2006 10:51 PMQuotemkirk - 13/5/2006 6:33 PMI finally downloaded and listened to the audio…I have never bothered to listen to it before. When I get I chance I will have to get a copy of the whole flight loop and booster loops.As I said before in the relevant thread, I would really, really love to hear those if there's any chance of them being posted here.I'll second that.And here's my dumb question- perhaps it's been asked and answered, but these Q&A threads are so long, it's hard to tell.Q: Looking at the SRBs, I've noticed that one has a thick black band at the top, but the other does not. Why is this?...please educate me.
abacus - 20/5/2006 12:25 PMIt is obvious which one is which when they are connected to the ET, but i assume it allows you to tell them apart after separation and during recovery
mkirk - 18/5/2006 6:43 PMIn order to prevent an “Over G” of the orbiter, one of the engines must be shutdown early. The time of the shutdown will be dependent on the type of failure that caused the stuck throttle…typically shutdown will be at MECO minus 2 minutes or at a orbiter velocity > 23,000 feet per second.
PlanetStorm - 5/5/2006 3:37 PMNot possible to redirect ISS power to the orbiter?
mkirk - 12/5/2006 6:38 PMFor 51-F when the first engine exceeded it’s redline parameter and based on the limit switch being in Auto (always in Auto at launch), the engine controller shut the engine down and the orbiter’s general purpose computers automatically inhibited the limit software for the remaining to engines. Once an engine fails the crew is trained to expect to re-enable the limit software as soon as possible (i.e. abort capability). This is usually called up to the crew by mission control. Since the first engine failure was actually do to a sensor problem and not a real engine problem, and since the other engines were also in danger of being erroneously shutdown by faulty sensors, and since the shuttle was at an appropriate abort boundary; mission control called up to the crew “Main Engine Limits Inhibit”. This was done to prevent any additional engine shutdowns for bad sensors...if MCC or the crew had noticed a real problem with the engine a manual shutdown still could have been performed.
wbmiller3 - 23/5/2006 9:55 PMOne of the great unsung heroes of the shuttle program, Jenny Howard, was the Booster that day. She realized from the signature on the first engine failure that the turbine discharge temperature ducers were flaking out, and made the call to inhibit limits. The ducers went sour on a second engine after that - this call prevented an unnecessary shutdown and subsequent abort.Added - I see Mr. Kirkman already answered this, but I left it here as a salute to Ms. Howard.
Ben - 1/6/2006 3:19 PMThey did wear a helmet with their jump suits from 5-51L.